riversong code showcase

Source/Riversong/Game/Vfx/ProjectileManagerSystem.cs

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+using Cysharp.Threading.Tasks;
+using Unity.Mathematics;
+using UnityEngine;
+using UnityEngine.AddressableAssets;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    [Service(typeof(IProjectileManager))]
+    public class ProjectileManagerSystem : GameSystem, IProjectileManager
+    {
+        private const float ProjectileSpeed = 4;
+
+        [InjectService]
+        private IIntentLogicExecutor _intentLogicExecutor;
+
+        public ProjectileManagerSystem(IServiceLocator serviceLocator) : base(serviceLocator)
+        {
+        }
+
+        public float ComputeProjectileTravelTime(Agent source, Agent target)
+        {
+            return math.distance(source.Position, target.Position) / ProjectileSpeed;
+        }
+
+        public void FireProjectile(Agent source, Agent target)
+        {
+            _ = FireProjectileAsync(source, target, ComputeProjectileTravelTime(source, target));
+        }
+
+        private async UniTask FireProjectileAsync(Agent source, Agent target, float travelTime)
+        {
+            var prefabRef = source.Definition.Projectile;
+            var projectile = await prefabRef.InstantiateAsync();
+
+            var p0 = (Vector3)source.Position;
+            var p1 = (Vector3)target.Position;
+
+            // const float peakHeightPerMeter = 0.1f;
+            // var peak = Vector3.Distance(p0, p1) * peakHeightPerMeter;
+
+            var t = 0f;
+            while (t < 1)
+            {
+                t = Mathf.Clamp01(t + Time.deltaTime / travelTime);
+
+                var position = Vector3.Lerp(p0, p1, t);
+                //position.y += 4 * peak * t * (1 - t);
+
+                var rotation = Quaternion.LookRotation((position - projectile.transform.position).normalized);
+
+                projectile.transform.SetPositionAndRotation(position, rotation);
+
+                await UniTask.NextFrame();
+            }
+
+            Addressables.ReleaseInstance(projectile);
+
+            _intentLogicExecutor.CancelRemainingIntents(target);
+        }
+    }
+}